In a way, this book fulfills Wittgenstein's prediction that the philosophy of the future will be written as a poetic composition. Whether that's good or bad for philosophy, well...
I wouldn't call "Finite and Infinite Games" a 'willful complication of thought,' as one reviewer put it; if it is, it is only in the sense that new ways of looking at the world seem complicated at first. That said, Carse's enthusiasm for his concept of finite and infinite games tends to get the better of him, inasmuch as he is often too quick to file phenomena into either the 'finite' category or the 'infinite' category, when a more subtle approach would be appropriate. But, as I said, this is more poetry than science.
Which is not to say that Carse's book is useless, or 'metaphysical': in fact, I found it to be one of the more profound books I've ever read, if only for the many startling thoughts contained in it. Carse's treatments of sexuality, the unspeakability of nature, indeed, the whole idea of an infinite activity, all resonated with me, if not for their truth, then for the possibility of their truth.
Possibility, in fact, is a major theme of this book: as Carse puts it: "Who must play cannot play." Which means, you have a lot more freedom than you think, if you are aware of the customary nature of human activities and how their boundaries can be played with. One doesn't have infinite power; indeed, infinite players, according to Carse, do not seek power as an end but only as a means to continuing play. How much truth there is in such a claim I leave to the reader, where it is sure to be much more lively.
In short, read this book, be captivated by it, but don't expect any final answers.